/etc/X11/Xsession.d/81overlay-scrollbar is in overlay-scrollbar 0.2.17.1+16.04.20151117-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # This file is sourced by Xsession(5), not executed.
if [ -z "$GTK2_MODULES" ] ; then
GTK2_MODULES="overlay-scrollbar"
else
GTK2_MODULES="$GTK2_MODULES:overlay-scrollbar"
fi
export GTK2_MODULES
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